function show(url){

    var h, w, x, y, par, temp;

    if (screen.height <= 480 || screen.width <= 640) {

                         alert("The resolution of your screen is low! Minimum require resolution of screen is 800x600.");

                return;

    }


    if (screen.width <= 1024 || screen.height <= 768) {

      h = screen.availHeight-24;

      w = screen.availWidth-10;

      par=",top=0,left=0,width="+w+",height="+h;

    } else {

      w=1024;

      h=768;

      x = (screen.availWidth - w)/2;

      y = (screen.availHeight - h)/2;

      par=",top="+x+",left="+y+",width="+w+",height="+h;

    }

          temp=window.open(url,"Booker","scrollbars=yes,resizable=yes,status=yes"+par);
}